Electrical protective apparatus.



K A. P. DIXON. ELECTRICAL PROTECTIVE APPARATUS.

APPLICATION FILED DEC.24,1910.

Patented Mar. 25, 1913.

2 SHEETS-SEEET1.

A. F. DIXON.

ELECTRICAL PROTECTIVE APPARATUS.

APPLICATION FILED D5c.24,1910.

1,057, 126.. Patented Mar. 25, 1913.

2 SHEETS-SHEET 2.

f Any.

3Q spark gap arresters and heat'coilsfandtheir UNTTEDV s'rTEs PATENT OFFICE.

Airosr. DIXON, '0E NEWARK, INEW JERSEY, AssIGNon To WESTERN ELECTRIC COMPANY, or NEW YORK, N. Y

., A CORPORATION or LLrNoIs.

'ELECTRICAL PROTECTIVE APPARATUS.

Specification of To all whom t may vconcern .Be it known th'at I, Amos F. DIXON, citizen of lthe United States, residing at-Newark, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Electrical Protective Apparatus', of which the following is a full, clear, concise, and exact description.

This invention relates to electric protective apparatus and -particularly tothe t-ypel employed in -telephone exchanges wherein protective devices, such as heat coils and 4spark gap arresters are mounted upon a-wire distributing frame; y f l The `object of the invention -is the Vpro-l vision of a rigid and inexpensive structure for supporting the protective devices.

'A .special object is toy render vthejumpe'r. -terminals readily accessible, that is, to en :y able each; pair to be located on the sam"'side I of the'mounting` plate, without the introduction of an additional or dead strip, 'or nel' cessitating the use .of the securing bolt as1 part of the'electriccircuit.

To accomplishthese objectsthere is prcrl vided a flat and relatively thick rectangular4 sheet' metal ground plate directlyjattached' -along one edge ltoa 'suitable s`1 pport, thisz plate supporting on both sides'ilof it the circuit-connecting springs and having a row of holes near the supporting edge through which` terminal clips "of certain o`f the springs extend, and .also having on` each side of the opposite-edge'at and relatively thin metal lstrips with punched out tongues for guiding 4the blocks forming' the'spark-gap arresters.

In the drawings-'Figure- 1 is a side elevation of a portion of a distributing frame showing an arrester'strip supporting the structure of'this invention, the two outer springs of the lower setof springs being removed. Fig. 2 is ase'ctional view onthe linel 42--2 of Fig. l.

Referring to' Fig. l, o; represents the arrester' stripor support, which is preferably of metal, supported at intervals by hori-` o zontal arms b, also offmetal, 'projectingV from fthe .fanningrstripi 0, of wood, carried upon 'the 'distributing frameproper. The .metallic ground plated,- preferably 'of sheet metal, is secured in a vertical position on the Letters Patent.

posed sets of arrester springs, the Isprings and Patented Marea 1913.

Application filed December 24, 1910. Serial N o. 599,121. .l

sections of insulation going to make up an opposed pair being clamped together and to the plate-by' bolts g, h surrounded by ,suitable bushings z', 7'.' The protective devices carried upon the free ends ot' these springs operate in a manner wellknown and the connections'thereot need not therefore be de' scribed, it being merely added that the two A l outer springs c, 7o', are the switchboard sprlngs and the two inner u, u', the line springs. These springs are of fairly heavystock. The ground plate just below the 'point .of support of each set is provided .with

an opening-0.A In the method of'wiring for which the protector. 'shown-is adapted, the v connections of the cable `"conduetgms m, m

to the line springs' u,- u `respectively are intended to permanentawhilethe conneciftions to switchboard-springs 7c, lo are made by twisted pair of temporary Wiies or jumpers wel', the other ends of which are connectedwith `fheterminals of the cable f laing' tothe switchboard (not shown).l It

is these latter kconnectionstherezl'ore which f are frequently changed, andv to enable vboth switchboard springlugs k, la to be -located, `on the' same side of the ground plate d, each switchboard lug la is extendedandfpassed through the corresponding opening o and terminates adjacent itscompanion switchboard lug k on the other side, and',l as men- `tioned above,`being of heavy stock, there is no necessity for providing he openings o with bushings. l' The ground distance" beyond the point of supper-trof the heat coils p, pf and their auxiliary springs g, g to form 'ia ,backing for a pair of relaon opposite sides thereof and separated plate d. is extended for some' thereby. These' strips have tonguesgj, 75

.punched up to outline arectangle "n three sides and thereby to fom seats for the inner carbons of the pairse, en", the line springs u -u maintaining the 'outer members and the interposed mica sheets ,in engagement withl the inner members of the pairs, From the foregoing it will Abe 'apparent that the structure described is asimple, compact and desirable one for the purpose, and accomplishes the resultsought with an exceedingly small number of parts. I claim:

i arrester strip a by bolts j, f; The ground g plate carries upon its loppositefaces op- In a protective apparatus, the co1ubinai tion Witha main frame, of a flat and relatively thick rectangular sheetwrnetal-ground plate supported along one edge by said frame and having a row of perforations near that edge, a. pair of Hat and relatively. thin sheet metal strips secured one on each side of said ground plate along the other edge thereof, rows of spark gap arresters mounted on said metal strips, said strips having seriesof tongues punched out therefrom to form lateral guides for said arresters, heat coils located on each side of said plate, contact springs adapted to maintainsaid arresters and saidv coils in place,

Copies of this patent may be obtained for securing mea-ns for said springs adjacent 15 said perforations,ar1d terminal clips integral i With said springs` certain of said terminal clips projecting through said perforations whereby the jumper fivire connections to springs located on one side ofpsaid plate 20 may be made', on the other side thereof.

In Witnesswhereof, I hereunto subscribe my name this 21st day of Dec. A. D., 19l0.

AMOS F. DIXON.

Witnesses:

IRVING MACDONALD,

I-I. L. CLARK.

vepents each, by addressing the Commissioner of Patents. Washington, D. C. 

